PCA (Prometheus Certified Associate) sample exam question with answer 545

Question:
What is Prometheus?

1. An open source logging tool and indexer
2. An open source monitoring tool and time series database
3. A proprietary logging tool and indexer
4. A proprietary monitoring tool and time series database

Answer:
B - is the correct answer. More at overview
A - is incorrect as Prometheus is a monitoring tool, not a logging tool
C - is incorrect as Prometheus is open source, not proprietary. Additionally, Prometheus is a monitoring tool, not a logging tool
D - is incorrect as Prometheus is open source, not proprietary